Phytopathology. 1997 Jan;87(1):66-70. doi: 10.1094/PHYTO.1997.87.1.66.
ABSTRACT Experiments were conducted in farmers' fields at two locations of the irrigated lowlands of Laguna province in southern Luzon island, Philippines, during the wet seasons of 1993 and 1994. Nine rice populations were studied including pure stands, two-component mixtures, two-gene combinations of backcrossed lines containing varying combinations of the bacterial blight resistance genes Xa-4, xa-5, and Xa-10, and a non-isogenic cultivar containing Xa-4 and partial resistance to bacterial blight. The area under the disease progress curve (AUDPC) of both gene combinations studied was significantly less than the single most effective gene of each combination deployed singly. A mixture of a susceptible and a resistant line expressed an AUDPC significantly less than the mean of its component pure stands, but two other mixtures did not. The cultivar IR20, which contains both Xa-4 and partial resistance, reduced the AUDPC by about two-thirds as compared with IR-BB4, which contains Xa-4 and little or no partial resistance.
1993 年和 1994 年湿季，在菲律宾吕宋岛南部拉古纳省灌溉低地的两个地点的农民田间进行了实验。研究了包括纯系、二组分混合物、含有细菌枯萎病抗性基因 Xa-4、xa-5 和 Xa-10 不同组合的回交系的两个基因组合以及含有 Xa-4 和对细菌枯萎病部分抗性的非同源栽培品种在内的 9 个水稻群体。研究的两个基因组合的病害进展曲线下面积（AUDPC）明显小于每个组合单独部署的最有效单基因。感病和抗病系的混合物的 AUDPC 明显低于其组成纯系的平均值，但另外两个混合物则没有。与仅含有 Xa-4 和很少或没有部分抗性的 IR-BB4 相比，含有 Xa-4 和部分抗性的 IR20 可将 AUDPC 降低约三分之二。
